| 11. | The flowers have yellowish green tepals and appear in late spring.
|
| 12. | Tepals are yellow-orange, up to 10 cm long.
|
| 13. | Tepals are white to pale lavender with prominent dark purple midveins.
|
| 14. | Ovary is egg-shaped; stamens longer than the tepals.
|
| 15. | Tepals are white to pale pink with a darker red midvein.
|
| 16. | Tepals are white or pale red with a dark purple midvein.
|
| 17. | Flowers are narrowly bell-shaped with pinkish-purple tepals.
|
| 18. | The inconspicuously three-lobed perianth consists of three connate tepals.
|
| 19. | The tepal lobes are not modified and appressed to the fruit.
|
| 20. | Nectar is produced in perigonal nectaries at the base of the tepals.
|
